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Update zip archive specification #303

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10 changes: 7 additions & 3 deletions gdtf-spec.md
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Expand Up @@ -131,9 +131,13 @@ selfcontained binary file format of a glTF scene or model.

## File Format Definition

To describe the device type, a zip file with the extension
"*.gdtf" is used. The archive shall contain a description XML file and
resource files. Some of the resource files are located in a folder
To describe the device type, a ZIP archive compliant with PKWARE ZIP File Format Specification version 6.3.3,
using the file extension "*.gdtf", shall be used.
The archive shall contain a description XML file and associated resource files.
Only the STORE (no compression, method 0) and DEFLATE (method 8) compression methods shall be used.
No other compression methods are permitted.
The archive shall not use encryption, password protection, or digital signature features.
Some of the resource files are located in a folder
structure. There are two folders defined: "./wheels" and "./models". The
folder "./models" has subfolders for a better structural overview:
- ./models/3ds
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